<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Hello Security!</title>
</head>
<body>
<h1>Hello Security</h1>
<form th:action="@{/logouttttt}" method="post">
    <input type="submit" value="Log Out"/>
</form>
<a th:href="@{/logouttttt}">Log Out</a>
</body>
</html>